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Am J Physiol Renal Physiol 281: F1117-F1122, 2001;
0363-6127/01 $5.00
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Vol. 281, Issue 6, F1117-F1122, December 2001

Role of NHE isoforms in mediating bicarbonate reabsorption along the nephron

Tong Wang1, Max Hropot2, Peter S. Aronson1,3, and Gerhard Giebisch1

1 Department of Cellular and Molecular Physiology; 2 Aventis Pharma Deutschland, Frankfurt am Main 65926, Germany; and 3 Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06520-8026

This study assessed the functional role of Na+/H+ exchanger (NHE) isoforms NHE3 and NHE2 in the proximal tubule, loop of Henle, and distal convoluted tubule of the rat kidney by comparing sensitivity of transport to inhibition by Hoe-694 (an agent known to inhibit NHE2 but not NHE3) and S-3226 (an agent with much higher affinity for NHE3 than NHE2). Rates of transport of fluid (Jv) and HCO<UP><SUB>3</SUB><SUP>−</SUP></UP> (JHCO3) were studied by in situ microperfusion. In the proximal tubule, addition of ethylisopropylamiloride or S-3226 significantly reduced Jv and JHCO3, but addition of Hoe-694 caused no significant inhibition. In the loop of Henle, JHCO3 was also inhibited by S-3226 and not by Hoe-694, although much higher concentrations of S-3226 were required than what was necessary to inhibit transport in the proximal tubule. In contrast, in the distal convoluted tubule, JHCO3 was inhibited by Hoe-694 but not by S-3226. These results are consistent with the conclusion that NHE2 rather than NHE3 is the predominant isoform responsible for apical membrane Na+/H+ exchange in the distal convoluted tubule, whereas NHE3 is the predominant apical isoform in the proximal tubule and possibly also in the loop of Henle.

sodium/hydrogen exchange; acidification; proximal; loop of Henle; distal convoluted tubule; sodium/hydrogen exchanger


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